You have to install the entire game because game sizes have gotten too large for the read speed of discs. Load times would be absolutely awful if you didn't install games to the HDD. Loading a level this gen is like loading almost an entire game from last gen, so you need the increased read speed of the HDD. It was either people bitching about this, or people bitching about load times that would be four times longer than they are now. If you are running out of space just delete a game or two that you aren't playing. Its not that hard.Huh? I've installed all my games without any issues what so ever, works just as fine as on PS4 here, the drive is just a bit louder. Launch EU/Swedish XB1 btw.
But... What I don't get is WHY I need to install the whole game discs. On 360 you had the option to run games from the disc, here it doesn't matter if you're just testing a game for an hour to check something out, you still have to install the 30-50GB game on the 500GB HDD. Mandatory install is seriously the worst idea ever. My HDD is 70% full and I've had the console for 2 months. And it still stands that you can't swap the HDD to a bigger one right? What were they thinking?